Electronic timbre controller for musical instruments



FIG. 1 is a front, top and left side perspective view of an electronic timbre controller for musical instruments showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a right side elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view; and

FIG. 6 is a bottom plan view. 

The ornamental design for an electronic timbre controller for musical instruments, as shown and described. 